What are the chances that a hemophiliac male and an unaffected female could have a baby that is a hemophiliac male?
A) 0%
B) 25%
C) 50%
D) 75%

Question

Quizplus · Accepted Answer

Hemophilia is a sex-linked recessive disorder carried on the X chromosome. A hemophiliac male (X^hY) and an unaffected female (XX) can only have carrier daughters (X^hX) and unaffected sons (XY), so the chance of having a hemophiliac male child is 0%.

What Are the Chances That a Hemophiliac Male and an Unaffected